Definition A.3 (Definition 16.1 in [1]}) 
Let \(|T|\)  be the length of the longest edge of \(T\) , and \(\varrho _{T}\)  be the radius of the largest ball which can be inscribed in \({T}\) (inradius of \(T\) ), then the ratio \(\beta _T:={|T|}/{\varrho _{T}} \)  is called the shape parameter of \(T\) .

